/Engine/Plugins/Experimental/Mutable/Source/CustomizableObject/Public/MuCO/MultilayerProjector.h
Given a new identifier, create a new Virtual Layer (if non-existent).
void CreateVirtualLayer ( [FCustomizableObjectInstanceDescriptor](API\Plugins\CustomizableObject\MuCO\FCustomizableObjectInstanceDescr-) & Descriptor, const [FName](API\Runtime\Core\UObject\FName) & Id )